Method for soldering solar cell, cell string, photovoltaic module, and soldering device

ABSTRACT

A method for soldering a solar cell, includes: placing a plurality of back contact cells on a soldering platform, where back surfaces of the back contact cells face away from the soldering platform, and electrodes corresponding to two adjacent back contact cells have opposite polarities in a connection direction of a plurality of to-be-connected ribbons; placing the plurality of to-be-connected ribbons on the electrodes of the plurality of back contact cells by using a first clamping portion, a second clamping portion, and a plurality of third clamping portions, where the first clamping portion, the second clamping portion, and the plurality of third clamping portions respectively correspond to head ends, tail ends, and middle portions of the plurality of ribbons; and heating the plurality of ribbons by using a heater to connect the plurality of ribbons to the plurality of back contact cells.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application is a divisional of U.S. application Ser. No. 17/845,962filed Jun. 21, 2022, and claims the benefit of Chinese PatentApplication No. 202210201738.9 filed Mar. 3, 2022. The contents of allof the aforementioned applications, including any intervening amendmentsthereto, are incorporated herein by reference.

BACKGROUND

The disclosure belongs to the field of solar cells, and moreparticularly, to a method for soldering a solar cell, a cell string, aphotovoltaic module, and a soldering device.

A solar cell converts sunlight to electric energy by means of aphotovoltaic effect of a semiconductor p-n junction.

Two adjacent solar cells are usually connected to each other by using aribbon, so as to form a cell string, and then the cell string ispackaged into a photovoltaic module. In this way, a service life of thesolar cell can be prolonged, and reliability of the solar cell can beenhanced. However, the ribbon cannot be effectively produced andpositioned by a conventional series soldering technology, resulting inpoor soldering precision, which does not meet a requirement forhigh-precision soldering of a back contact cell.

SUMMARY

This disclosure provides a method for soldering a solar cell, a cellstring, a photovoltaic module, and a soldering device, to improvesoldering precision of a back contact cell.

A method for soldering a solar cell in an embodiment of this disclosurecomprises:

-   -   placing a plurality of back contact cells on a soldering        platform, where back surfaces of the back contact cells face        away from the soldering platform, and electrodes corresponding        to two adjacent back contact cells have opposite polarities in a        connection direction of ribbons;    -   placing the plurality of to-be-connected ribbons on the        electrodes of the plurality of back contact cells by using a        first clamping portion, a second clamping portion, and third        clamping portions, where the first clamping portion, the second        clamping portion, and the third clamping portions respectively        correspond to head ends, tail ends, and middle portions of the        plurality of ribbons; and    -   heating the plurality of ribbons by using a heater to connect        the plurality of ribbons to the plurality of back contact cells.

In a class of this embodiment, placing the plurality of to-be-connectedribbons on the electrodes of the plurality of back contact cellscomprises:

-   -   simultaneously placing the plurality of to-be-connected ribbons        on the electrodes of the plurality of back contact cells; and    -   heating the plurality of ribbons by using a heater to connect        the plurality of ribbons to the plurality of back contact cells        comprises:    -   simultaneously heating the plurality of ribbons by using the        heater to simultaneously connect the plurality of ribbons to the        plurality of back contact cells.

In a class of this embodiment, the simultaneously placing the pluralityof to-be-connected ribbons on the electrodes of the plurality of backcontact cells comprises:

-   -   simultaneously placing all of the ribbons required for an entire        cell string on the electrodes of the plurality of back contact        cells; and    -   simultaneously heating the plurality of ribbons by using the        heater to simultaneously connect the plurality of ribbons to the        plurality of back contact cells comprises:    -   simultaneously heating all of the ribbons required for the        entire cell string by using the heater, to simultaneously        connect all of the ribbons required for the entire cell string        to all of the back contact cells.

In a class of this embodiment, the ribbons comprise a plurality of firstribbons and a plurality of second ribbons;

-   -   the first clamping portion comprises a plurality of first        clamping jaws and a plurality of second clamping jaws, the first        clamping jaws and the second clamping jaws are in staggered        arrangement, the first clamping jaws are configured to clamp        head ends of the first ribbons, and the second clamping jaws are        configured to clamp head ends of the second ribbons; and    -   the second clamping portion comprises a plurality of third        clamping jaws and a plurality of fourth clamping jaws, the third        clamping jaws and the fourth clamping jaws are in staggered        arrangement, the third clamping jaws are configured to clamp        tail ends of the first ribbons, and the fourth clamping jaws are        configured to clamp tail ends of the second ribbons.

In a class of this embodiment, a gap is formed between each two adjacentback contact cells, a plurality of third clamping portions are arranged,and each third clamping portion corresponds to one gap.

In a class of this embodiment, a distance between two adjacent thirdclamping portions is greater than a width of the back contact cell.

In a class of this embodiment, the distance between the two adjacentthird clamping portions equals a sum of the width of the back contactcell and a width of the gap.

In a class of this embodiment, a distance between the first clampingportion and the adjacent third clamping portions is greater than a widthof the back contact cell.

In a class of this embodiment, the distance between the first clampingportion and the adjacent third clamping portions equals a sum of thewidth of the back contact cell and a width of the gap.

In a class of this embodiment, a distance between the second clampingportion and the adjacent third clamping portions is greater than a widthof the back contact cell.

In a class of this embodiment, the distance between the second clampingportion and the adjacent third clamping portions equals a sum of thewidth of the back contact cell and a width of the gap.

In a class of this embodiment, the ribbons comprise a plurality of firstribbons and a plurality of second ribbons; one of two adjacent thirdclamping portions is configured to clamp the first ribbons, and theother of the two adjacent third clamping portions is configured to clampthe second ribbons; and before heating the plurality of ribbons by usingthe heater to connect the plurality of ribbons to the plurality of backcontact cells, the method for soldering a solar cell further comprises:

-   -   cutting clamped portions of the plurality of first ribbons and        the plurality of second ribbons by using cutting members of the        third clamping portions.

In a class of this embodiment, cutting clamped portions of the pluralityof first ribbons and the plurality of second ribbons by using cuttingmembers of the third clamping portions comprises:

-   -   simultaneously cutting the clamped portions of the plurality of        first ribbons and the plurality of second ribbons by using the        cutting members.

In a class of this embodiment, simultaneously cutting the clampedportions of the plurality of first ribbons and the plurality of secondribbons by using the cutting members comprises:

-   -   simultaneously cutting the clamped portions of all of the first        ribbons and all of the second ribbons required for the entire        cell string by using the cutting members.

In a class of this embodiment, the ribbons comprise a plurality of firstribbons and a plurality of second ribbons, and the third clampingportions are configured to clamp the first ribbons and the secondribbons; the third clamping portions comprise cutting members, thecutting members of two adjacent third clamping portions respectivelycorrespond to one of the first ribbons and one of the second ribbons,and before heating the plurality of ribbons by using the heater toconnect the plurality of ribbons to the plurality of back contact cells,the method for soldering a solar cell further comprises:

-   -   cutting clamped portions of the plurality of first ribbons by        using the cutting members corresponding to the first ribbons;        and    -   cutting clamped portions of the plurality of second ribbons by        using the cutting members corresponding to the second ribbons.

In a class of this embodiment, cutting clamped portions of the pluralityof first ribbons by using the cutting members corresponding to the firstribbons comprises:

-   -   simultaneously cutting the clamped portions of the plurality of        first ribbons by using the cutting members corresponding to the        first ribbons; and    -   cutting clamped portions of the plurality of second ribbons by        using the cutting members corresponding to the second ribbons        comprises:    -   simultaneously cutting the clamped portions of the plurality of        second ribbons by using the cutting members corresponding to the        second ribbons.

In a class of this embodiment, simultaneously cutting the clampedportions of the plurality of first ribbons by using the cutting memberscorresponding to the first ribbons comprises:

-   -   simultaneously cutting the clamped portions of all of the first        ribbons required for the entire cell string by using the cutting        members corresponding to the first ribbons; and    -   simultaneously cutting the clamped portions of the plurality of        second ribbons by using the cutting members corresponding to the        second ribbons comprises:    -   simultaneously cutting the clamped portions of all of the second        ribbons required for the entire cell string by using the cutting        members corresponding to the second ribbons.

In a class of this embodiment, transport portions are arranged among thefirst clamping portion, the second clamping portion, and the thirdclamping portions, and before placing the plurality of to-be-connectedribbons on the electrodes of the plurality of back contact cells byusing the first clamping portion, the second clamping portion, and thethird clamping portions, the method for soldering a solar cell furthercomprises:

-   -   moving a plurality of pressing tools from initial positions to        lifted positions by using the transport portions; and    -   grabbing the plurality of ribbons by using the first clamping        portion, the second clamping portion, and the third clamping        portions; and    -   after placing the plurality of to-be-connected ribbons on the        electrodes of the plurality of back contact cells by using the        first clamping portion, the second clamping portion, and the        third clamping portions, the method for soldering a solar cell        further comprises:    -   moving the plurality of pressing tools from the lifted positions        to pressed positions by using the transport portions, to cause        the pressing tools to press the back contact cells on which the        ribbons are placed.

In a class of this embodiment, moving a plurality of pressing tools frominitial positions to lifted positions by using the transport portionscomprises:

-   -   simultaneously moving the plurality of pressing tools from the        initial positions to the lifted positions by using the transport        portions;    -   grabbing the plurality of ribbons by using the first clamping        portion, the second clamping portion, and the third clamping        portions comprises:    -   simultaneously grabbing the plurality of ribbons by using the        first clamping portion, the second clamping portion, and the        third clamping portions; and    -   moving the plurality of pressing tools from the lifted positions        to pressed positions by using the transport portions, to cause        the pressing tools to press the back contact cells on which the        ribbons are placed comprises:    -   simultaneously moving the plurality of pressing tools from the        lifted positions to the pressed positions by using the transport        portions, to cause the pressing tools to simultaneously press        the back contact cells on which the ribbons are placed.

In a class of this embodiment, simultaneously moving the plurality ofpressing tools from the initial positions to the lifted positions byusing the transport portions comprises:

-   -   simultaneously all of the pressing tools required for the entire        cell string from the initial positions to the lifted positions        by using the transport portions;    -   simultaneously grabbing the plurality of ribbons by using the        first clamping portion, the second clamping portion, and the        third clamping portions comprises:    -   simultaneously grab all of the ribbons required for the entire        cell string by using the first clamping portion, the second        clamping portion, and the third clamping portions; and    -   simultaneously moving the plurality of pressing tools from the        lifted positions to the pressed positions by using the transport        portions, to cause the pressing tools to simultaneously press        the back contact cells on which the ribbons are placed        comprises:    -   simultaneously moving all of the pressing tools required for the        entire cell string from the lifted positions to the pressed        positions by using the transport portions, to cause all of the        pressing tools required for the entire cell string to        simultaneously press the back contact cells on which the ribbons        are placed.

A cell string in an embodiment of this disclosure is soldered by usingany of the above methods for soldering a solar cell.

A photovoltaic module in an embodiment of this disclosure comprises theabove cell string.

A soldering device in an embodiment of this disclosure comprises asoldering platform, a first clamping portion, a second clamping portion,third clamping portions, and a heater, where the soldering platform isconfigured to carry a plurality of back contact cells, back surfaces ofthe back contact cells face away from the soldering platform, andelectrodes corresponding to two adjacent back contact cells haveopposite polarities in a connection direction of ribbons; the firstclamping portion, the second clamping portion, and the third clampingportions respectively correspond to head ends, tail ends, and middleportions of the plurality of ribbons, and are configured to place aplurality of to-be-connected ribbons on the electrodes of the pluralityof back contact cells; and the heater is configured to heat theplurality of ribbons to connect the plurality of ribbons to theplurality of back contact cells.

In a class of this embodiment, the first clamping portion, the secondclamping portion, and the third clamping portions are configured tosimultaneously place the plurality of to-be-connected ribbons on theelectrodes of the plurality of back contact cells; and the heater isconfigured to simultaneously heat the plurality of ribbons tosimultaneously connect the plurality of ribbons to the plurality of backcontact cells.

In a class of this embodiment, the first clamping portion, the secondclamping portion, and the third clamping portions are configured tosimultaneously place all of the ribbons required for an entire cellstring on the electrodes of the plurality of back contact cells; and theheater is configured to simultaneously heat all of the ribbons requiredfor the entire cell string, to simultaneously connect all of the ribbonsrequired for the entire cell string to all of the back contact cells.

In a class of this embodiment, the ribbons comprise a plurality of firstribbons and a plurality of second ribbons;

-   -   the first clamping portion comprises a plurality of first        clamping jaws and a plurality of second clamping jaws, the first        clamping jaws and the second clamping jaws are in staggered        arrangement, the first clamping jaws are configured to clamp        head ends of the first ribbons, and the second clamping jaws are        configured to clamp head ends of the second ribbons; and    -   the second clamping portion comprises a plurality of third        clamping jaws and a plurality of fourth clamping jaws, the third        clamping jaws and the fourth clamping jaws are in staggered        arrangement, the third clamping jaws are configured to clamp        tail ends of the first ribbons, and the fourth clamping jaws are        configured to clamp tail ends of the second ribbons.

In a class of this embodiment, a gap is formed between each two adjacentback contact cells, a plurality of third clamping portions are arranged,and each third clamping portion corresponds to one gap.

In a class of this embodiment, a distance between two adjacent thirdclamping portions is greater than a width of the back contact cell.

In a class of this embodiment, the distance between the two adjacentthird clamping portions equals a sum of the width of the back contactcell and a width of the gap.

In a class of this embodiment, a distance between the first clampingportion and the adjacent third clamping portions is greater than a widthof the back contact cell.

In a class of this embodiment, the distance between the first clampingportion and the adjacent third clamping portions equals a sum of thewidth of the back contact cell and a width of the gap.

In a class of this embodiment, a distance between the second clampingportion and the adjacent third clamping portions is greater than a widthof the back contact cell.

In a class of this embodiment, the distance between the second clampingportion and the adjacent third clamping portions equals a sum of thewidth of the back contact cell and a width of the gap.

In a class of this embodiment, the ribbons comprise a plurality of firstribbons and a plurality of second ribbons; one of two adjacent thirdclamping portions is configured to clamp the first ribbons, and theother of the two adjacent third clamping portions is configured to clampthe second ribbons; and the third clamping portions comprise cuttingmembers configured to cut clamped portions of the plurality of firstribbons and the plurality of second ribbons.

In a class of this embodiment, the cutting members are configured tosimultaneously cut the clamped portions of the plurality of firstribbons and the plurality of second ribbons.

In a class of this embodiment, the cutting members are configured tosimultaneously cut the clamped portions of all of the first ribbons andall of the second ribbons required for the entire cell string.

In a class of this embodiment, the ribbons comprise a plurality of firstribbons and a plurality of second ribbons, and the third clampingportions are configured to clamp the first ribbons and the secondribbons; the third clamping portions comprise cutting members, thecutting members of two adjacent third clamping portions respectivelycorrespond to one of the first ribbons and one of the second ribbons,and the cutting members corresponding to the first ribbons areconfigured to cut clamped portions of the plurality of first ribbons;and the cutting members corresponding to the second ribbons areconfigured to cut clamped portions of the plurality of second ribbons.

In a class of this embodiment, the cutting members corresponding to thefirst ribbons are configured to simultaneously cut the clamped portionsof the plurality of first ribbons; and the cutting members correspondingto the second ribbons are configured to simultaneously cut the clampedportions of the plurality of second ribbons.

In a class of this embodiment, the cutting members corresponding to thefirst ribbons are configured to simultaneously cut the clamped portionsof all of the first ribbons required for the entire cell string; and thecutting members corresponding to the second ribbons are configured tosimultaneously cut the clamped portions of all of the second ribbonsrequired for the entire cell string.

In a class of this embodiment, transport portions are arranged among thefirst clamping portion, the second clamping portion, and the thirdclamping portions, and the transport portions are configured to move aplurality of pressing tools from initial positions to lifted positions;the first clamping portion, the second clamping portion, and the thirdclamping portions are configured to grab the plurality of ribbons; andthe transport portions are configured to move the plurality of pressingtools from the lifted positions to pressed positions, to cause thepressing tools to press the back contact cells on which the ribbons areplaced.

In a class of this embodiment, the transport portions are configured tosimultaneously move the plurality of pressing tools from the initialpositions to the lifted positions; the first clamping portion, thesecond clamping portion, and the third clamping portions are configuredto simultaneously grab the plurality of ribbons; and the transportportions are configured to simultaneously move the plurality of pressingtools from the lifted positions to the pressed positions, to cause thepressing tools to simultaneously press the back contact cells on whichthe ribbons are placed.

In a class of this embodiment, the transport portions are configured tosimultaneously move all of the pressing tools required for the entirecell string from the initial positions to the lifted positions; thefirst clamping portion, the second clamping portion, and the thirdclamping portions are configured to simultaneously grab all of theribbons required for the entire cell string; and the transport portionsare configured to simultaneously move all of the pressing tools requiredfor the entire cell string from the lifted positions to the pressedpositions, to cause all of the pressing tools required for the entirecell string to simultaneously press the back contact cells on which theribbons are placed.

According to the method for soldering a solar cell, the cell string, thephotovoltaic module, and the soldering device in the embodiments of thisdisclosure, the back surfaces of the back contact cells face upwardduring soldering, and the plurality of ribbons are simultaneouslyclamped, transferred, and soldered. Therefore, soldering precision andproduction efficiency can be improved, and production costs can bereduced. In addition, since the soldering precision is improved, afinger having an opposite polarity can be designed closer to a busbarwithout resulting in a short circuit. In this way, the finger cancollect currents of more areas, thereby facilitating improvement of cellefficiency and module efficiency.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a schematic flowchart of a method for soldering a solar cellaccording to an embodiment of this disclosure.

FIG. 2 is a schematic diagram of a scenario of the method for solderinga solar cell according to an embodiment of this disclosure.

FIG. 3 is a schematic structural diagram of a cell string soldered bythe method for soldering a solar cell according to an embodiment of thisdisclosure.

FIG. 4 is a schematic diagram of a scenario of the method for solderinga solar cell according to an embodiment of this disclosure.

FIG. 5 is a schematic diagram of a scenario of the method for solderinga solar cell according to an embodiment of this disclosure.

FIG. 6 is a schematic diagram of a scenario of the method for solderinga solar cell according to an embodiment of this disclosure.

FIG. 7 is a schematic flowchart of a method for soldering a solar cellaccording to an embodiment of this disclosure.

FIG. 8 is a schematic diagram of a scenario of the method for solderinga solar cell according to an embodiment of this disclosure.

FIG. 9 is a schematic flowchart of a method for soldering a solar cellaccording to an embodiment of this disclosure.

FIG. 10 is a schematic diagram of a scenario of the method for solderinga solar cell according to an embodiment of this disclosure.

FIG. 11 is a schematic flowchart of a method for soldering a solar cellaccording to an embodiment of this disclosure.

FIG. 12 is a schematic diagram of a scenario of the method for solderinga solar cell according to an embodiment of this disclosure.

DETAILED DESCRIPTION

To make objectives, technical solutions, and advantages of thisdisclosure clearer and more comprehensible, this disclosure is furtherdescribed in detail with reference to the accompanying drawings andembodiments. It is to be understood that the specific embodimentsdescribed herein are only used for explaining this disclosure, and arenot used for limiting this disclosure.

Referring to FIG. 1 , FIG. 2 , FIG. 3 , FIG. 4 , FIG. 5 , and FIG. 6 , amethod for soldering a solar cell in an embodiment of this disclosurecomprises the following steps:

Step S11: Placing a plurality of back contact cells 20 on a solderingplatform 102, where back surfaces of the back contact cells 20 face awayfrom the soldering platform 102, and electrodes corresponding to twoadjacent back contact cells 20 have opposite polarities in a connectiondirection of ribbons 10.

Step S14: Placing the plurality of to-be-connected ribbons 10 on theelectrodes of the plurality of back contact cells 20 by using a firstclamping portion 31, a second clamping portion 32, and third clampingportions 33, where the first clamping portion 31, the second clampingportion 32, and the third clamping portions 33 respectively correspondto head ends, tail ends, and middle portions of the plurality of ribbons10.

Step S17: Heating the plurality of ribbons 10 by using a heater 104 toconnect the plurality of ribbons 10 to the plurality of back contactcells 20.

According to the method for soldering a solar cell in this embodiment ofthis disclosure, the back surfaces of the back contact cells 20 faceupward during soldering, and the plurality of ribbons 10 aresimultaneously clamped, transferred, and soldered. Therefore, solderingprecision and production efficiency can be improved, and productioncosts can be reduced. In addition, since the soldering precision isimproved, a finger having an opposite polarity can be designed closer toa busbar without resulting in a short circuit. In this way, the fingercan collect currents of more areas, thereby facilitating improvement ofcell efficiency and module efficiency.

Specifically, in step S11, the plurality of back contact cells 20 areplaced on the soldering platform 102 with the back surfaces facingupward. Therefore, the back surfaces of the back contact cells 20 faceaway from the soldering platform 102, so that the ribbons 10 can beconveniently placed on the electrodes on the back surfaces of the backcontact cells 20.

Specifically, in step S11, the soldering platform 102 may comprisevacuum adsorption holes. After the plurality of back contact cells 20are placed on the soldering platform 102, the vacuum adsorption holesare revealed to adsorb the plurality of back contact cells 20 on thesoldering platform 102. Therefore, positions of the plurality of backcontact cells 20 are fixed by means of vacuum adsorption on thesoldering platform 102, so that relative movement can be prevented,thereby facilitating improvement of the soldering precision.

Further, after step S17, the vacuum adsorption holes may be covered, anda cell string 100 is taken from the soldering platform 102 by amanipulator.

Further, the cell string 100 may be transported to a cell stringtypesetting machine from the soldering platform 102. The cell stringtypesetting machine arranges a plurality of cell strings 100 and thentransport the cell strings to a laminating machine to fabricate aphotovoltaic module.

Specifically, in step S11, a scratch-proof member may be arranged on asurface of the soldering platform 102 in contact with the back contactcells 20. The scratch-proof member is, for example, a teflon tape orother high temperature resistant smooth materials. In this way, frontsurfaces of the back contact cells 20 can be prevented from beingscratched by the soldering platform 102.

Specifically, in step S11, a temperature of the soldering platform 102may range from 120° C. to 170° C., for example, 120° C., 125° C., 130°C., 145° C., 150° C., 165° C., or 170° C. The temperature of thesoldering platform 102 may be constant, such as a constant value withinthe range of 120° C. to 170° C. In this way, warpage of the cell string100 can be reduced.

Specifically, referring to FIG. 4 , in step S11, the plurality of backcontact cells 20 may be arranged on the soldering platform 102 by a cellarrangement mechanism with the polarities of the electrodescorresponding to the plurality of back contact cells 20 in theconnection direction of the ribbons 10 being opposite. The plurality ofarranged back contact cells 20 may be further simultaneously placed onthe soldering platform 102.

Specifically, before step S11, the positions of the plurality of backcontact cells 20 may be corrected by using the manipulator, and then theplurality of back contact cells 20 may be simultaneously placed on thesoldering platform 102. Since the positions are corrected beforetransfer at one time, positioning precision and the productionefficiency can be improved.

Specifically, referring to FIG. 5 and FIG. 6 , in step S11, theconnection direction of the ribbons 10 is a length direction of theribbons 10. It may be understood that, along the length direction of theribbons 10, each ribbon 10 is connected to the two adjacent back contactcells 20. The plurality of back contact cells 20 are successivelyarranged along the length direction of the ribbons 10.

Further, one cell string 100 comprises 2-20 back contact cells 20, forexample, 2, 3, 4, 5, 10, 15, or 20 back contact cells.

Further, in this embodiment, referring to FIG. 4 and FIG. 6 , the cellstring 100 comprises 4 back contact cells 20. The 4 back contact cells20 are successively arranged along the length direction of the ribbons10.

Specifically, in step S11, the expression “electrodes corresponding totwo adjacent back contact cells 20 have opposite polarities” means thatbusbars corresponding to the two adjacent back contact cells 20 haveopposite polarities. It is to be noted that, the ribbons 10 are solderedto the busbars of the back contact cells 20.

In the method for soldering a solar cell in this embodiment of thisdisclosure, precisions of soldering between center lines of the ribbons10 and center points of the busbars of the back contact cells 20 reach±0.2 mm. That is to say, in the cell string 100 soldered by using themethod for soldering a solar cell in this embodiment of this disclosure,offsets of the center lines of the ribbons 10 from the center points ofthe busbars of the back contact cells 20 are less than 0.2 mm.

Further, referring to FIG. 4 , the electrode of each back contact cell20 comprises a plurality of first busbars and a plurality of secondbusbars. The first busbars and the second busbars have oppositepolarities. The plurality of first busbars and the plurality of secondbusbars are alternately arranged along a width direction of the ribbons10. That is to say, in the width direction of the ribbons 10, one secondbusbar is arranged between two adjacent first busbars, and one firstbusbar is arranged between two adjacent second busbars. Each firstbusbar is provided with a plurality of first solder joints 21successively arranged along an extending direction of the first busbar.Each second busbar is provided with a plurality of second solder joints22 successively arranged along an extending direction of the secondbusbar.

It may be understood that, one ribbon 10 is connected to a column offirst solder joints 21 of one of the two adjacent back contact cells 20to a column of second solder joints 22 of the other of the two adjacentback contact cells 20. In this way, the ribbon 10 is connected to afirst busbar of one of the two adjacent back contact cells 20 to asecond busbar of the other of the two adjacent back contact cells 20.

Further, a quantity of the first solder joints 21 provided on each firstbusbar is an even number, and a quantity of the second solder joints 22provided on the second busbar is also an even number.

Specifically, in an example in FIG. 4 , the back surface of each backcontact cell 20 is provided with 10 busbars, that is, 5 positive busbarsand 5 negative busbars. It may be understood that, in other embodiments,a quantity of the busbars may be other values.

Specifically, insulation members may be arranged on two sides of eachbusbar on the back surface of the back contact cell 20. In this way, theribbons 10 can be prevented from coming into contact with an electrodehaving an opposite polarity and thereby forming a short circuit.Further, the insulation members may be strip-shaped, and are parallel tothe busbars. Further, insulation adhesives may be printed on two sidesof the busbar on the back surface of the back contact cell 20, and aredried to be cured into the insulation members. In this way, theinsulation adhesives are arranged more precisely.

Specifically, conductive members may be arranged on the busbars on theback surface of the back contact cell 20. The conductive members may bemelted by means of heating. The conductive members are, for example,solder pastes. By means of the solder pastes, soldering between thebusbars and the ribbons 10 is realized.

Specifically, in step S14, the ribbons 10 may be flat ribbons 10.

It may be understood that, in other embodiments, the ribbons 10 may beround ribbons 10.

Specifically, in step S14, all of the ribbons 10 may be simultaneouslyplaced on the electrodes of the corresponding back contact cells 20.Therefore, the ribbons 10 may be placed at one time. During theplacement, the ribbons 10 are always fixed by the first clamping portion31, the second clamping portion 32, and the third clamping portions 33,so that high-precision alignment of the ribbons 10 to the back contactcells 20 is ensured.

It may be understood that, in other embodiments, all of the ribbons 10may alternatively be successively placed one by one, or successivelyplaced in batches. A specific manner of placing the plurality ofto-be-connected ribbons on the electrodes of the plurality of backcontact cells is not limited herein.

Specifically, referring to FIG. 5 and FIG. 6 , in step S14, the ribbons10 comprise a plurality of first ribbons 11 and a plurality of secondribbons 12. The first clamping portion 31 comprises a plurality of firstclamping jaws 311 and a plurality of second clamping jaws 312. The firstclamping jaws 311 and the second clamping jaws 312 are in staggeredarrangement. The first clamping jaws 311 are configured to clamp headends of the first ribbons 11, and the second clamping jaws 312 areconfigured to clamp head ends of the second ribbons 12. The secondclamping portion 32 comprises a plurality of third clamping jaws 321 anda plurality of fourth clamping jaws 322. The third clamping jaws 321 andthe fourth clamping jaws 322 are in staggered arrangement. The thirdclamping jaws 321 are configured to clamp tail ends of the first ribbons11, and the fourth clamping jaws 322 are configured to clamp tail endsof the second ribbons 12.

Further, the plurality of first ribbons 11 and the plurality of secondribbons 12 are in staggered arrangement in the width direction of theribbon 10. That is to say, in the width direction of the ribbon 10, onesecond ribbon 12 is arranged between two adjacent first ribbons 11, andone first ribbon 11 is arranged between two adjacent second ribbons 12.In this way, the first ribbons 11 and the second ribbons 12 respectivelycorrespond to the first busbars and the second busbars of the backcontact cells 20, thereby preventing dislocation.

Further, the first clamping jaws 311 and the second clamping jaws 312are in staggered arrangement in the width direction of the ribbons 10.That is to say, in the width direction of the ribbon 10, one secondclamping jaw 312 is arranged between two adjacent first clamping jaws311, and one first clamping jaw 311 is arranged between two adjacentsecond clamping jaws 312. In this way, the first clamping jaws 311 andthe second clamping jaws 312 respectively correspond to the firstribbons 11 and the second ribbons 12, thereby preventing dislocation.

Further, the first clamping jaws 311 and the second clamping jaws 312are flush with each other in a thickness direction of the ribbons 10. Inthis way, the first clamping jaws 311 and the second clamping jaws 312can be synchronously lifted and clamped, thereby improving clampingefficiency.

Further, the head ends of the first ribbons 11 and the second ribbons 12are in staggered arrangement in the length direction of the ribbons 10,thereby facilitating soldering of the ribbons to the busbars.

Further, the first clamping jaws 311 and the second clamping jaws 312are in staggered arrangement in the length direction of the ribbons 10.Since the head ends of the first ribbons 11 and the second ribbons 12are in staggered arrangement in the length direction of the ribbons 10,it is ensured that the first clamping jaws 311 and the second clampingjaws 312 clamp the head ends of the corresponding ribbons 10. Inaddition, a space may be provided for the first clamping jaws 311 andthe second clamping jaws 312, to prevent the first clamping jaws 311 andthe second clamping jaws 312 prevented from interfering with each otherduring the synchronous lifting and clamping.

It is to be noted that, the plurality of third clamping jaws 321 and theplurality of fourth clamping jaws 322 of the second clamping portion 32are similar to the plurality of first clamping jaws 311 and theplurality of second clamping jaws 312 of the first clamping portion 31.For explanation and description thereof, refer to the above. In order toavoid redundancy, details are not described herein again.

Specifically, referring to FIG. 5 and FIG. 6 , in step S14, the thirdclamping portions 33 corresponds to the middle portions of the pluralityof ribbons 10. Therefore, the middle portions of the plurality ofribbons 10 can be clamped. In this way, collapse of the middle portionscaused by clamping of only the head ends and the tail ends of theribbons 10 can be prevented, thereby preventing the ribbons 10 frombreaking during clamping or transfer. In addition, a degree of freedomof the middle portions of the ribbons 10 in the width direction of theribbons 10 is reduced, thereby facilitating improvement of thepositioning precision and the soldering precision of the ribbons 10.

Specifically, in step S17, the plurality of ribbons 10 may be heated bymeans of at least one of infrared heating, electromagnetic heating, hotair heating, or laser heating, to connect the ribbons 10 to theplurality of back contact cells 20. In other words, the heater 104 mayoperate based on at least one of principles such as the infraredheating, the electromagnetic heating, the hot air heating, or the laserheating.

Further, in this embodiment, the heater 104 comprises an infrared lightbox. An infrared soldering lamp tube is arranged in the infrared lightbox. In step S17, the infrared light box is pressed toward the ribbons10 and the back contact cells 20 by a preset distance to heat theribbons 10, so as to solder the ribbons 10 to the back contact cells 20.

It may be understood that, in other embodiments, the heater 104 may bean electromagnetic heater 104, an air heater, or a laser heater 104.

Preferably, step S14 comprises: simultaneously placing the plurality ofto-be-connected ribbons 10 on the electrodes of the plurality of backcontact cells 20. Step S17 comprises: simultaneously heat the pluralityof ribbons 10 by using the heater 104 to simultaneously connect theplurality of ribbons 10 to the plurality of back contact cells 20.

By simultaneously placing and soldering the plurality of ribbons 10, thesoldering efficiency can be improved. In addition, during the placement,relative positions of the plurality of ribbons 10 are fixed, so that thehigh-precision alignment of the ribbons 10 to the back contact cells 20is ensured.

More preferably, all of the ribbons 10 required for the entire cellstring 100 are simultaneously placed on the electrodes of the pluralityof back contact cells 20. All of the ribbons 10 required for the entirecell string 100 are simultaneously heated by using the heater 104, tosimultaneously connect all of the ribbons 10 required for the entirecell string 100 to all of the back contact cells 20.

In this way, all of the ribbons 10 required for the entire cell string100 can be simultaneously placed and soldered, thereby improving thesoldering efficiency. In addition, during the placement, relativepositions of all of the ribbons 10 required for the entire cell string100 are fixed, so that the high-precision alignment of the ribbons 10 tothe back contact cells 20 is ensured.

It may be understood that, in step S11, the plurality of back contactcells 20 may alternatively be simultaneously placed on the solderingplatform 102. By simultaneously placing the back contact cells 20, thesoldering efficiency can be improved.

Further, all of the back contact cells 20 required for the entire cellstring 100 may be simultaneously placed on the soldering platform 102.By simultaneously placing all of the back contact cells 20 required forthe entire cell string 100, the soldering efficiency can be furtherimproved.

Referring to FIG. 6 , optionally, a gap is formed each between twoadjacent back contact cells 20, a plurality of third clamping portions33 are arranged, and each third clamping portion 33 corresponds to onegap. In this way, the corresponding cut ribbons 10 can be clamped at thegaps. Therefore, even if the ribbons 10 are cut at the gaps, the ribbonsdo not drop from the third clamping portions 33, thereby preventingrepeated clamping of the ribbons 10 and facilitating improvement of theproduction efficiency. In addition, even if the ribbons 10 are cut atthe gaps, the ribbons do not displace at the third clamping portions 33,thereby ensuring the positioning accuracy of the ribbons 10.

Specifically, referring to FIG. 6 , the third clamping portions 33corresponding to two adjacent gaps respectively clamp the first ribbon11 and the second ribbon 12. In this way, portions clamped by the thirdclamping portions 33 correspond to portions of the ribbons 10 requiredto be cut, thereby facilitating positioning for cutting of the ribbons10 and improvement of the production efficiency. In addition, it can beensured that the corresponding ribbons 10 cut at the gaps are clamped bythe third clamping portions 33, thereby preventing the cut ribbons 10from falling off or displacing.

In an example in FIG. 6 , in a direction from the first clamping portion31 to the second clamping portion 32, 3 gaps, namely, a first gap, asecond gap, and a third gap are formed among 4 back contact cells 20.The third clamping portions 33 corresponding to the first gap clamp thesecond ribbons 12 cut at the first gap. The third clamping portions 33corresponding to the second gap clamp the first ribbons 11 cut at thesecond gap. The third clamping portions 33 corresponding to the thirdgap clamp the second ribbons 12 cut at the third gap.

It may be understood that, in other embodiments, the third clampingportions 33 may clamp the first ribbons 11 and the second ribbons 12.Even if the ribbons 10 do not need to be cut at the gaps, the thirdclamping portions 33 still clamp the ribbons. In this way, the ribbons10 that do not need to be cut at the gaps are prevented from collapsingas a result of an excessively large length, thereby preventing theribbons 10 from breaking. In addition, a degree of freedom of theribbons 10 that do not need to be cut at the gaps in the width directionof the ribbons 10 is reduced, thereby facilitating improvement of thepositioning precision and the soldering precision of the ribbons 10.

Referring to FIG. 6 , optionally, a distance S1 between the two adjacentthird clamping portions 33 is greater than a width w of the back contactcell 20.

It is to be noted that, the distance S1 between the two adjacent thirdclamping portions 33 is a distance between center points of the twoadjacent third clamping portions 33 in the length direction of theribbons 10.

Therefore, in a case that each third clamping portion 33 corresponds toone gap, it is ensured that the distance S1 between the two adjacentthird clamping portions 33 is large enough, so that it is ensured arange of the back contact cell 20 covered by the third clamping portion33 is relatively small. In this way, the third clamping portion 33 canbe prevented from interfering with the soldering between the ribbon 10and the back contact cell 20. In addition, a space may be reserved forplacing pressing tools 40 in FIG. 11 and FIG. 12 below, so as to avoidinterference between the third clamping portions 33 and the pressingtools 40. It may be understood that, the first clamping portion 31, thesecond clamping portion 32, and the third clamping portions 33 may beremoved from the back contact cells 20 after the pressing tools 40 areplaced and before soldering is performed.

Specifically, the distance S1 between the two adjacent third clampingportions 33 equals a sum of the width w of the back contact cell 20 anda width d of the gap.

Therefore, the distance S1 between the two adjacent third clampingportions 33 is constant, so that a length of the ribbon 10 between thetwo adjacent third clamping portions 33 is constant. In this way, thepositioning of the ribbons 10 at an interval of a predetermined lengthis realized, thereby improving the soldering precision.

Specifically, projections of centers of the third clamping portions 33on the soldering platform 102 are located on projections of center linesof the gaps on the soldering platform 102. Therefore, the third clampingportions 33 can be precisely positioned through the gaps, therebyprecisely positioning the ribbons 10. In addition, the third clampingportions 33 can be caused to be located at the centers of the gaps, sothat the third clamping portions 33 cover the back contact cells 20 ontwo sides by similar ranges, and the third clamping portions 33 can beprevented from covering back contact cells 20 on one sides by a largerrange. In this way, the third clamping portions 33 can be prevented frominterfering with the soldering between the ribbons 10 and the backcontact cells 20 on the sides.

Referring to FIG. 6 , optionally, a distance s2 between the firstclamping portion 31 and the adjacent third clamping portions 33 aregreater than the width w of the back contact cell 20.

It is to be noted that, the distance s2 between the first clampingportion 31 and the adjacent third clamping portions 33 is a distancebetween center points of the clamping jaws of the first clamping portion31 away from the third clamping portions 33 and the center points of thethird clamping portions 33 in the length direction of the ribbons 10.

For example, in an example in FIG. 6 , the clamping jaws of the firstclamping portion 31 away from the third clamping portions 33 are thesecond clamping jaws 312. In this case, the distance s2 between thefirst clamping portion 31 and the adjacent third clamping portions 33 isa distance between center points of the second clamping jaws 312 and thecenter points of the third clamping portions 33 in the length directionof the ribbons 10.

Therefore, in a case that each third clamping portion 33 corresponds toone gap, it is ensured that the distance s2 between the first clampingportion 31 and the adjacent third clamping portions 33 is large enough,so that it is ensured that a range of the back contact cell 20 exposedbetween the first clamping portion 31 and the third clamping portions 33is relatively large. In this way, the first clamping portion 31 and thethird clamping portions 33 can be prevented from interfering with thesoldering between the ribbons 10 and the back contact cell 20. Inaddition, a space may be reserved for placing pressing tools 40 in FIG.11 and FIG. 12 below, so as to avoid interference between the thirdclamping portions 33 and the pressing tools 40. It may be understoodthat, the first clamping portion 31, the second clamping portion 32, andthe third clamping portions 33 may be removed from the back contactcells 20 after the pressing tools 40 are placed and before soldering isperformed.

Specifically, the distance s2 between the first clamping portion 31 andthe adjacent third clamping portions 33 equal the sum of the width w ofthe back contact cell 20 and the width d of the gap.

Therefore, the distance s2 between the first clamping portion 31 and theadjacent third clamping portions 33 is constant, so that lengths of theribbons 10 between the first clamping portion 31 and the adjacent thirdclamping portions 33 are constant. In this way, the positioning of theribbons 10 at an interval of a predetermined length is realized, therebyimproving the soldering precision.

Specifically, the projections of the centers of the third clampingportions 33 on the soldering platform 102 are located on the projectionsof the center lines of the gaps on the soldering platform 102, and aprojection of a center of the first clamping portion 31 on the solderingplatform 102 is located outside projections of the back contact cells 20on the soldering platform 102.

Therefore, the third clamping portions 33 adjacent to the first clampingportion 31 can be precisely positioned through the gaps, therebyprecisely positioning the ribbons 10. In addition, the third clampingportions 33 can be caused to be located at the centers of the gaps, sothat the third clamping portions 33 cover the back contact cells 20 ontwo sides by similar ranges, and the third clamping portions 33 can beprevented from covering back contact cells 20 on one sides by a largerrange. In this way, the third clamping portions 33 can be prevented frominterfering with the soldering between the ribbons 10 and the backcontact cells 20 on the sides. In addition, a smaller portion of theback contact cells 20 or no portion of the back contact cell is coveredby the first clamping portion 31, so that the first clamping portion 31is prevented from interfering with the soldering between the ribbon 10and the back contact cells 20.

Referring to FIG. 6 , optionally, a distance s3 between the secondclamping portion 32 and the adjacent third clamping portions 33 isgreater than the width w of the back contact cell 20. Specifically, thedistance s3 between the second clamping portion 32 and the adjacentthird clamping portions 33 equals the sum of the width w of the backcontact cell 20 and the width d of the gap.

It is to be noted that, the distance s3 between the second clampingportion 32 and the adjacent third clamping portions 33 is similar to thedistance s2 between the first clamping portion 31 and the adjacent thirdclamping portions 33. For explanation and description thereof, refer tothe above. In order to avoid redundancy, details are not describedherein again.

Referring to FIG. 6 , FIG. 7 and FIG. 8 , optionally, the ribbons 10comprise a plurality of first ribbons 11 and a plurality of secondribbons 12. One of the two adjacent third clamping portions 33 isconfigured to clamp one of the first ribbons 11, and the other of thetwo adjacent third clamping portions 33 is configured to clamp one ofthe second ribbons 12. Before step S17, the method for soldering a solarcell further comprises the following steps:

Step S161: Cutting clamped portions of the plurality of first ribbons 11and the plurality of second ribbons 12 by using cutting members of thethird clamping portions 33.

Therefore, the first ribbons 11 and the second ribbons 12 arerespectively clamped, and the clamped portions of the ribbons 10 arecut. The cutting can be performed more precisely by positioning throughclamping.

It may be understood that, FIG. 8 and FIG. 6 show states of the ribbons10 before and after cutting.

Specifically, the first ribbons 11 and the second ribbons 12 may be cutsimultaneously. Alternatively, the first ribbons 11 may be first cut,and then the second ribbons 12 are cut. Alternatively, the secondribbons 12 may be first cut, and then the first ribbons 11 are cut.Alternatively, the first ribbons 11 and the second ribbons 12 may be cutalternately.

Specifically, the plurality of first ribbons 11 may be cutsimultaneously, may be successively cut one by one, or may besuccessively cut in batches. Likewise, the plurality of second ribbons12 may be cut simultaneously, may be successively cut one by one, or maybe successively cut in batches.

Preferably, step S161 comprises: simultaneously cutting the clampedportions of the plurality of first ribbons 11 and the plurality ofsecond ribbons 12 by using the cutting members of the third clampingportions 33. By simultaneously cutting the ribbons 10, the solderingefficiency can be improved.

More preferably, the clamped portions of all of the first ribbons 11 andall of the second ribbons 12 required for the entire cell string 100 maybe simultaneously cut by using the cutting members of the third clampingportions 33.

Therefore, the ribbons 10 may be cut at one time, thereby improving thesoldering efficiency. In addition, during the cutting, the ribbons 10are always fixed by the first clamping portion 31, the second clampingportion 32, and the third clamping portions 33, so that high-precisionalignment of the ribbons 10 to the back contact cells 20 is ensured.

Specifically, in an example in FIG. 7 , step S161 is between step S14and step S17. In other words, after the plurality of to-be-connectedribbons 10 are placed on the electrodes of the plurality of the backcontact cells 20, the clamped portions of the plurality of first ribbons11 and the plurality of second ribbons 12 are cut, and then theplurality of cut ribbons 10 are soldered to the plurality of the backcontact cells 20.

It may be understood that, in other embodiments, before step S14, thatis, before the plurality of to-be-connected ribbons 10 are placed on theelectrodes of the plurality of the back contact cells 20, the method forsoldering a solar cell may further comprise: grabbing the plurality ofribbons 10 by using the first clamping portion 31, the second clampingportion 32, and the third clamping portions 33. After the plurality ofribbons 10 are grabbed by using the first clamping portion 31, thesecond clamping portion 32, and the third clamping portions 33, theclamped portions of the plurality of first ribbons 11 and the pluralityof second ribbons 12 may be cut, and then the plurality of cut ribbons10 to be connected are placed on the electrodes of the plurality of theback contact cells 20. Since the plurality of ribbons 10 have beengrabbed and fixed during the cutting and therefore do not displace dueto the cutting, the positioning precision of the ribbons 10 can beimproved, thereby facilitating improvement of the soldering precision.In addition, since the ribbons 10 are cut before being placed on theback contact cells 20, adverse effects on the back contact cells 20during the cutting can be avoided.

Further, the plurality of ribbons 10 may be grabbed by using the firstclamping portion 31, the second clamping portion 32, and the thirdclamping portions 33 before step S11, that is, before the plurality ofback contact cells 20 are placed on the soldering platform 102.Alternatively, the plurality of ribbons 10 may be grabbed by using thefirst clamping portion 31, the second clamping portion 32, and the thirdclamping portions 33 during step S11. The plurality of ribbons 10 mayalternatively be grabbed by using the first clamping portion 31, thesecond clamping portion 32, and the third clamping portions 33 afterstep S11. A specific execution sequence is not limited herein.

It may be understood that, in other embodiments, during the grabbing ofthe plurality of ribbons 10 by using the first clamping portion 31, thesecond clamping portion 32, and the third clamping portions 33, theclamped portions of the plurality of first ribbons 11 and the pluralityof second ribbons 12 may be cut, and then the plurality of cut ribbons10 to be connected are placed on the electrodes of the plurality of theback contact cells 20. In this way, a time interval between the grabbingand the cutting can be reduced, thereby improving the productionefficiency.

Specifically, the clamped portions are portions of the ribbons 10clamped by the third clamping portions 33. Intersections of projectionsof the third clamping portions 33 on the soldering platform 102 andprojections of the ribbons 10 on the soldering platform 102 areprojections of the clamped portions on the soldering platform 102.

Specifically, the cutting members may be punching members. In otherwords, the clamped portions of the plurality of first ribbons 11 and theplurality of second ribbons 12 may be punched by using the punchingmembers of the third clamping portions 33. Cutting planes formed bypunching are smooth and vertical, and cuts are more aestheticallypleasing. It may be understood that, in other embodiments, each cuttingmember may be a device having a cutting function, such as scissors, ablade, or a laser cutter.

Specifically, a section of the ribbon 10 in the clamped portion of theribbon 10 may be cut by using the cutting member. Therefore, a space isformed between two cuts of the cut ribbon 10, thereby avoiding a shortcircuit.

Further, a ratio of a length of the cut section of the ribbon 10 to alength of the clamped portion is 0.5. Therefore, a distance between thetwo cuts of the cut ribbon 10 is constant, so that the cell string 100is more aesthetically pleasing. In addition, the distance between thetwo cuts of the cut ribbon 10 is quantized to further avoid the shortcircuit.

It may be understood that, in other embodiments, the ratio of the lengthof the cut section of the ribbon 10 to the length of the clamped portionmay be 0.2, 0.25, 0.4, 0.6, or other values. This is not limited herein.

Further, a projection of a connecting line between the two cuts of thecut ribbon 10 on the soldering platform 102 intersects a projection ofthe gap on the soldering platform 102. In this way, it is ensured thatthe ribbon 10 corresponding to the gap is cut, so that the cut ribbon 10can be prevented from spanning the gap and coming into contact with theback contact cell 20 on an other side of the gap, thereby preventingadverse effects on the back contact cell 20 on the other side of thegap.

Further, a projection of a center point of the distance between the twocuts of the cut ribbon 10 on the soldering platform 102 is located onthe projection of the center line of the gap on the soldering platform102. Therefore, distances from the two cuts of the cut ribbon 10 to thegap are the same, so that the cell string 100 is more aestheticallypleasing. In addition, the cutting member can be conveniently positionedduring the cutting, thereby improving the soldering efficiency.

Referring to FIG. 6 , FIG. 9 and FIG. 10 , optionally, the ribbons 10comprise a plurality of first ribbons 11 and a plurality of secondribbons 12. The third clamping portions 33 are configured to clamp thefirst ribbons 11 and the second ribbons 12. The third clamping portions33 comprise cutting members. The cutting members of the two adjacentthird clamping portions 33 respectively correspond to the first ribbons11 and the second ribbons 12. Before step S17, the method for solderinga solar cell further comprises the following steps:

Step S162: Cutting clamped portions of the plurality of first ribbons 11by using the cutting members corresponding to the first ribbons 11.

Step S163: Cutting clamped portions of the plurality of second ribbons12 by using the cutting members corresponding to the second ribbons 12.

The first ribbons 11 and the second ribbons 12 are clampedsimultaneously, and the clamped portions of the ribbons 10 areselectively cut, so that a quantity of the clamped portions of theribbons 10 can be increased, and lengths of portions of the ribbons 10that are not clamped can be reduced, thereby preventing the portionsthat are not clamped from collapsing and easily breaking. In addition, adegree of freedom of the portions of the ribbons 10 that are not clampedin the width direction of the ribbons 10 is reduced, therebyfacilitating improvement of the positioning precision and the solderingprecision of the ribbons 10.

It may be understood that, FIG. 10 and FIG. 6 show states of the ribbons10 before and after cutting.

Specifically, step S162 and step S163 may be performed simultaneously.In other words, the clamped portions of the second ribbons 12 may be cutby using the cutting members corresponding to the second ribbons 12during the cutting of the clamped portions of the plurality of firstribbons 11 by using the cutting members corresponding to the firstribbons 11. In this way, a cutting time can be shortened, therebyimproving the soldering efficiency.

It may be understood that, alternatively, the clamped portions of theplurality of first ribbons 11 may be first cut by using the cuttingmembers corresponding to the first ribbons 11, and then the clampedportions of the plurality of second ribbons 12 may be cut by using thecutting members corresponding to the second ribbons 12. Alternatively,the clamped portions of the plurality of second ribbons 12 may be firstcut by using the cutting members corresponding to the second ribbons 12,and then the clamped portions of the plurality of first ribbons 11 maybe cut by using the cutting members corresponding to the first ribbons11. Alternatively, the clamped portions of some of the first ribbons 11may be cut by using the cutting members corresponding to the firstribbons 11 and the clamped portions of some of the second ribbons 12 maybe cut by using the cutting members corresponding to the second ribbons12, alternately.

Specifically, the plurality of first ribbons 11 may be cutsimultaneously, may be successively cut one by one, or may besuccessively cut in batches. Likewise, the plurality of second ribbons12 may be cut simultaneously, may be successively cut one by one, or maybe successively cut in batches.

Specifically, in an example in FIG. 9 , step S162 and step S163 arebetween step S14 and step S17. In other words, after the plurality ofto-be-connected ribbons 10 are placed on the electrodes of the pluralityof the back contact cells 20, the clamped portions of the plurality offirst ribbons 11 are cut by using the cutting members corresponding tothe first ribbons 11, the clamped portions of the plurality of secondribbons 12 are cut by using the cutting members corresponding to thesecond ribbons 12, and then the plurality of cut ribbons 10 are solderedto the plurality of the back contact cells 20.

It may be understood that, in other embodiments, before step S14, thatis, before the plurality of to-be-connected ribbons 10 are placed on theelectrodes of the plurality of the back contact cells 20, the method forsoldering a solar cell may further comprise: grabbing the plurality ofribbons 10 by using the first clamping portion 31, the second clampingportion 32, and the third clamping portions 33. After the plurality ofribbons 10 are grabbed by using the first clamping portion 31, thesecond clamping portion 32, and the third clamping portions 33, theclamped portions of the plurality of first ribbons 11 are cut by usingthe cutting members corresponding to the first ribbons 11, the clampedportions of the plurality of second ribbons 12 are cut by using thecutting members corresponding to the second ribbons 12, and then theplurality of cut ribbons 10 to be connected are placed on the electrodesof the plurality of the back contact cells 20. Since the plurality ofribbons 10 have been grabbed and fixed during the cutting and thereforedo not displace due to the cutting, the positioning precision of theribbons 10 can be improved, thereby facilitating improvement of thesoldering precision.

It may be understood that, in other embodiments, during the grabbing ofthe plurality of ribbons 10 by using the first clamping portion 31, thesecond clamping portion 32, and the third clamping portions 33, theclamped portions of the plurality of first ribbons 11 are cut by usingthe cutting members corresponding to the first ribbons 11, the clampedportions of the plurality of second ribbons 12 are cut by using thecutting members corresponding to the second ribbons 12, and then theplurality of cut ribbons 10 to be connected are placed on the electrodesof the plurality of the back contact cells 20. In this way, a timeinterval between the grabbing and the cutting can be reduced, therebyimproving the production efficiency.

Specifically, the clamped portions are portions of the ribbons 10clamped by the third clamping portions 33. It may be understood that,since the third clamping portions 33 clamp the first ribbons 11 and thesecond ribbons 12, in FIG. 10 , the projections of the third clampingportions 33 on the soldering platform 102 intersect projections of thefirst ribbons 11 and the second ribbons 12 on the soldering platform102. In FIG. 10 , cut areas are separated from areas that are not cut bydashed lines in FIG. 10 , and correspond to areas in FIG. 6 covered bythe third clamping portions 33. That is to say, regardless of theexample in FIG. 8 or the example in FIG. 10 , the areas in FIG. 6covered by the third clamping portions 33 are the cut areas.

Preferably, step S162 comprises: simultaneously cutting the clampedportions of the plurality of first ribbons 11 by using the cuttingmembers corresponding to the first ribbons 11. Step S163 comprises:simultaneously cutting the clamped portions of the plurality of secondribbons 12 by using the cutting members corresponding to the secondribbons 12. By simultaneously cutting the ribbons 10, the solderingefficiency can be improved.

More preferably, the clamped portions of all of the first ribbons 11required for the entire cell string 100 may be simultaneously cut byusing the cutting members corresponding to the first ribbons 11. Theclamped portions of all of the second ribbons 12 required for the entirecell string 100 may be simultaneously cut by using the cutting memberscorresponding to the second ribbons 12.

Therefore, the ribbons 10 may be cut simultaneously at one time, therebyimproving the soldering efficiency. In addition, during the cutting, theribbons 10 are always fixed by the first clamping portion 31, the secondclamping portion 32, and the third clamping portions 33, so thathigh-precision alignment of the ribbons 10 to the back contact cells 20is ensured.

Referring to FIG. 11 and FIG. 12 , optionally, transport portions arearranged among the first clamping portion 31, the second clampingportion 32, and the third clamping portions 33. Before step S14, themethod for soldering a solar cell further comprises the following steps:

Step S12: Moving a plurality of pressing tools 40 from initial positionsto lifted positions by using the transport portions.

Step S13: Grabbing the plurality of ribbons 10 by using the firstclamping portion 31, the second clamping portion 32, and the thirdclamping portions 33.

After step S14, the method for soldering a solar cell further comprisesthe following step:

Step S15: Moving the plurality of pressing tools 40 from the liftedpositions to pressed positions by using the transport portions, to causethe pressing tools 40 to press the back contact cells 20 on which theribbons 10 are placed.

By lifting the pressing tools 40 before the ribbons 10 are grabbed, thepressing tools 40 can be prevented from interfering with the grabbing ofthe ribbons 10. In addition, after the plurality of ribbons 10 areplaced on the electrodes of the plurality of back contact cells 20, thepressing tools 40 are pressed, so that the plurality of back contactcells 20 and the plurality of ribbons 10 can be simultaneously pressed.Therefore, the plurality of back contact cells 20 and the plurality ofribbons 10 do not move during the soldering, thereby improving thesoldering precision.

Specifically, the initial positions are positions of the pressing tools40 before contact with the transport portions. The initial positions maybe located on a conveyor. After the pressing tools 40 are used, thetransport portions may place the pressing tools 40 on the conveyor toreturn to the initial positions for use next time.

Specifically, the lifted positions are positions higher than the initialpositions. That is to say, the transport portions lift the plurality ofpressing tools 40 from the initial positions. When the pressing tools 40are at the lifted positions, the grabbing of the ribbons 10 by the firstclamping portion 31, the second clamping portion 32, and the thirdclamping portions 33 is not interfered, and the back contact cells 20 onwhich the ribbons 10 are placed can be conveniently pressed after theribbons 10 are placed on the back contact cells 20.

Specifically, the pressed positions are positions where the pressingtools 40 press the back contact cells 20 on which the ribbons 10 areplaced.

Specifically, each of the transport portions comprises a sucker and/or aclamping member. Further, the sucker comprises a vacuum sucker and/or amagnetic sucker. Therefore, various implementation forms of thetransport portions are provided. The implementation form may be selectedaccording to actual production requirements, thereby helping adapt tovarious production scenarios.

Specifically, the expression “transport portions are arranged among thefirst clamping portion 31, the second clamping portion 32, and the thirdclamping portions 33” means as follows: In the length direction of theribbons 10, the transport portion is arranged between the first clampingportion 31 and the third clamping portions 33 adjacent to the firstclamping portion 31, and is configured to transport the pressing tools40 between the first clamping portion 31 and the third clamping portions33 adjacent to the first clamping portion 31; the transport portion isarranged between the second clamping portion 32 and the third clampingportions 33 adjacent to the second clamping portion 32 and is configuredto transport the pressing tools 40 between the second clamping portion32 and the third clamping portions 33 adjacent to the second clampingportion 32; and the transport portion is arranged between the twoadjacent third clamping portions 33, and is configured to transport thepressing tool 40 between the two adjacent third clamping portions 33.

In other words, in the length direction of the ribbons 10, the pressingtool 40, namely, a first pressing tool is arranged between the firstclamping portion 31 and the third clamping portions 33 adjacent to thefirst clamping portion 31; the pressing tool 40, namely, a secondpressing tool is arranged between the second clamping portion 32 and thethird clamping portions 33 adjacent to the second clamping portion 32;and. the pressing tool 40, namely, a third pressing tool is arrangedbetween the two adjacent third clamping portions 33.

It may be understood that, at least two pressing tools 40 of the firstpressing tools, the second pressing tools, and the plurality of thirdpressing tools may be connected to form one pressing tool 40. Thepressing tool 40 may be transported at one time, thereby facilitatingimprovement of precision of positioning the pressing tools 40.

Further, the first pressing tools, the second pressing tools, and theplurality of third pressing tools are connected to form an entirepressing tool 40. In this way, the efficiency and the precision ofpositioning the pressing tools 40 can be maximized.

It may be understood that, in other embodiments, in the length directionof the ribbons 10, the pressing tools 40 may be arranged in one or moreof the following three areas. A first area is an area between the firstclamping portion 31 and the third clamping portions 33 adjacent to thefirst clamping portion 31. A second area is an area between the secondclamping portion 32 and the third clamping portions 33 adjacent to thesecond clamping portion 32. A third area is an area between the twoadjacent third clamping portions 33.

Specifically, in step S12, each pressing tool 40 may be provided with aplurality of pressing needles. Each pressing needle corresponds to onesolder joint of the back contact cell 20. By means of the pressingneedles, the intensity of pressure of a soldering area can be increased,so that a soldering effect is more desirable.

Further, surfaces of the pressing needles may be covered with aluminalayers. By means of the alumina layers, insulation can be achieved.Further, the pressing needles may be aluminum needles. Therefore, thesurfaces of the pressing needles may be covered with the alumina layersthrough oxidation.

Specifically, in step S12, a quantity of cross beams of the pressingtool 40 may be same as a quantity of the solder joints of each busbar ofthe back contact cell 20.

Specifically, the pressing tool 40 comprises a plurality of cross beams.An extending direction of each cross beam is perpendicular to a lengthdirection of the ribbons 10. In this way, the pressing tool 40 can pressthe ribbon 10 and the back contact cell 20 more effectively, therebyfacilitating improvement of the soldering precision.

Further, in a case that the pressing tool 40 press the back contact cell20 on which the ribbon 10 is placed, the solder joints of the backcontact cell 20 are exposed from a gap between two adjacent cross beams.In this way, convenient soldering can be achieved, and the pressing tool40 can be prevented from interfering with the soldering.

Specifically, in step S13, one ribbon 10, a plurality of ribbons 10, asection of the ribbon 10, or a plurality of sections of the ribbons 10may be grabbed by using the first clamping portion 31, the secondclamping portion 32, and the third clamping portions 33.

In this embodiment, all of the ribbons 10 are grabbed by using the firstclamping portion 31, the second clamping portion 32, and the thirdclamping portions 33. Therefore, the ribbons 10 can be clamped andtransferred at one time. During the placement, the ribbons 10 are alwaysfixed by the first clamping portion 31, the second clamping portion 32,and the third clamping portions 33, so that high-precision alignment ofthe ribbons 10 to the back contact cells 20 is ensured.

It may be understood that, in other embodiments, the ribbons 10 may besuccessively grabbed one by one or successively grabbed in batches.

Preferably, step S12 comprises: simultaneously moving the plurality ofpressing tools 40 from the initial positions to the lifted positions byusing the transport portions. Step S13 comprises: simultaneouslygrabbing the plurality of ribbons 10 by using the first clamping portion31, the second clamping portion 32, and the third clamping portions 33.Step S15 comprises: simultaneously moving the plurality of pressingtools 40 from the lifted positions to the pressed positions by using thetransport portions, to cause the pressing tools 40 to simultaneouslypress the back contact cells 20 on which the ribbons 10 are placed.

By simultaneously grabbing and placing the plurality of pressing tools40 and simultaneously grabbing the plurality of ribbons 10, thesoldering efficiency can be improved. In addition, during the placementof the pressing tools 40, all of the ribbons 10 required for the entirecell string 100 are always clamped by the first clamping portion 31, thesecond clamping portion 32, and the third clamping portions 33, so thatrelative positions are fixed, thereby ensuring the high-precisionalignment of the ribbons 10 to the back contact cells 20.

More preferably, all of the pressing tools 40 required for the entirecell string 100 may be simultaneously moved from the initial positionsto the lifted positions by using the transport portions. All of theribbons 10 required for the entire cell string 100 are simultaneouslygrabbed by using the first clamping portion 31, the second clampingportion 32, and the third clamping portions 33. All of the pressingtools 40 required for the entire cell string 100 are simultaneouslymoved from the lifted positions to the pressed positions by using thetransport portions, to cause all of the pressing tools 40 required forthe entire cell string 100 to simultaneously press the back contactcells 20 on which the ribbons 10 are placed.

In this way, all of the pressing tools 40 required for the entire cellstring 100 can be simultaneously grabbed and placed, and the ribbonsrequired for the entire cell string 100 can be simultaneously grabbed,thereby improving the soldering efficiency. In addition, during theplacement of the pressing tools 40, all of the ribbons 10 required forthe entire cell string 100 are always clamped by the first clampingportion 31, the second clamping portion 32, and the third clampingportions 33, so that relative positions are fixed, thereby ensuring thehigh-precision alignment of the ribbons 10 to the back contact cells 20.

Optionally, the head ends of all of the ribbons 10 required for theentire cell string 100 may be grabbed by using the first clampingportion 31. The first clamping portion 31 IS moved to pull out theribbons 10 from a ribbon coil. After all of the ribbons 10 are pulledout by a preset distance, the second clamping portion 32 clamps the tailends of all of the ribbons 10 and cut the tail ends of all of theribbons 10 to separate the tail ends from the ribbon coil. During thepulling out of the ribbons 10 from the ribbon coil by the first clampingportion 31, the third clamping portions 33 may correspondingly clamp theribbons 10. Therefore, the ribbons 10 can be fabricated at one time.During the fabrication of the ribbons 10, the ribbons 10 aresuccessively fixed by the first clamping portion 31, the second clampingportion 33, and the third clamping portions 32, so that high-precisionalignment of the ribbons 10 to the back contact cells 20 is ensured.

It may be understood that, in other embodiments, the ribbons 10 may besuccessively fabricated one by one or successively fabricated inbatches.

To sum up, according to the method for soldering a solar cell in thisembodiment of this disclosure, the ribbons 10 can be fabricated,grabbed, clamped, and placed at one time, and the pressing tools 40 canbe grabbed, placed, and soldered at one time. During the fabrication,grabbing, clamping, and placement of the ribbons 10, the ribbons 10 arealways fixed by the first clamping portion 31, the second clampingportion 32, and the third clamping portions 33, so that high-precisionalignment of the ribbons 10 to the back contact cells 20 is ensured.

Referring to FIG. 3 , a cell string 100 in an embodiment of thisdisclosure is soldered by using any of the above methods for soldering asolar cell.

A photovoltaic module in an embodiment of this disclosure comprises theabove cell string 100.

According to the cell string 100 and the photovoltaic module in theembodiments of this disclosure, the back surfaces of the back contactcells 20 face upward during soldering, and the plurality of ribbons 10are simultaneously clamped, transferred, and soldered. Therefore,soldering precision and production efficiency can be improved, andproduction costs can be reduced. In addition, since the solderingprecision is improved, a finger having an opposite polarity can bedesigned closer to a busbar without resulting in a short circuit. Inthis way, the finger can collect currents of more areas, therebyfacilitating improvement of cell efficiency and module efficiency.

For explanation and description of the cell string 100 and thephotovoltaic module, refer to the above. In order to avoid redundancy,details are not described herein again.

Referring to FIG. 2 and FIG. 6 , a soldering device in an embodiment ofthis disclosure comprises a soldering platform 102, a first clampingportion 31, a second clamping portion 32, third clamping portions 33,and a heater 104. The soldering platform 102 is configured to carry aplurality of back contact cells 20, and back surfaces of the backcontact cells 20 face away from the soldering platform 102. Electrodescorresponding to two adjacent back contact cells 20 have oppositepolarities in a connection direction of ribbons 10. The first clampingportion 31, the second clamping portion 32, and the third clampingportions 33 respectively correspond to head ends, tail ends, and middleportions of the plurality of ribbons 10, and are configured to place aplurality of to-be-connected ribbons 10 on the electrodes of theplurality of back contact cells 20 in the connection direction of theribbons 10. The heater 104 is configured to heat the plurality ofribbons 10 to connect the plurality of ribbons 10 to the plurality ofback contact cells 20.

According to the soldering device in this embodiment of this disclosure,the back surfaces of the back contact cells 20 face upward duringsoldering, and the plurality of ribbons 10 are simultaneously clamped,transferred, and soldered. Therefore, soldering precision and productionefficiency can be improved, and production costs can be reduced. Inaddition, since the soldering precision is improved, a finger having anopposite polarity can be designed closer to a busbar without resultingin a short circuit. In this way, the finger can collect currents of moreareas, thereby facilitating improvement of cell efficiency and moduleefficiency.

For explanation and description of the soldering device, refer to theabove. In order to avoid redundancy, details are not described hereinagain.

Preferably, the first clamping portion 31, the second clamping portion32, and the third clamping portions 33 are configured to simultaneouslyplace the plurality of to-be-connected ribbons 10 on the electrodes ofthe plurality of back contact cells 20. The heater 104 is configured tosimultaneously heat the plurality of ribbons 10 to simultaneouslyconnect the plurality of ribbons 10 to the plurality of back contactcells 20.

More preferably, the first clamping portion 31, the second clampingportion 32, and the third clamping portions 33 are configured tosimultaneously place all of the ribbons 10 required for an entire cellstring 100 on the electrodes of the plurality of back contact cells 20.Simultaneously heating the plurality of ribbons 10 by using the heater104 to simultaneously connect the plurality of ribbons 10 to theplurality of back contact cells 20 comprises: simultaneously heating, bythe heater 104, all of the ribbons 10 required for the entire cellstring 100, to simultaneously connect all of the ribbons 10 required forthe entire cell string 100 to all of the back contact cells 20.

Optionally, the ribbons 10 comprise a plurality of first ribbons 11 anda plurality of second ribbons 12. The first clamping portion 31comprises a plurality of first clamping jaws 311 and a plurality ofsecond clamping jaws 312. The first clamping jaws 311 and the secondclamping jaws 312 are in staggered arrangement. The first clamping jaws311 are configured to clamp head ends of the first ribbons 11, and thesecond clamping jaws 312 are configured to clamp head ends of the secondribbons 12. The second clamping portion 32 comprises a plurality ofthird clamping jaws 321 and a plurality of fourth clamping jaws 322. Thethird clamping jaws 321 and the fourth clamping jaws 322 are instaggered arrangement. The third clamping jaws 321 are configured toclamp tail ends of the first ribbons 11, and the fourth clamping jaws322 are configured to clamp tail ends of the second ribbons 12.

Optionally, a gap is formed between each two adjacent back contact cells20, a plurality of third clamping portions 33 are arranged, and eachthird clamping portion 33 corresponds to one gap.

Optionally, a distance between two adjacent third clamping portions 33is greater than a width of each of the back contact cells 20.

Optionally, the distance between two adjacent third clamping portions 33equals a sum of the width of the back contact cell 20 and a width of thegap.

Optionally, a distance between the first clamping portion 31 and theadjacent third clamping portions 33 is greater than the width of theback contact cell 20.

Optionally, the distance between the first clamping portion 31 and theadjacent third clamping portions 33 equals the sum of the width of theback contact cell 20 and the width of the gap.

Optionally, a distance between the second clamping portion 32 and theadjacent third clamping portions 33 is greater than the width of theback contact cell 20.

Optionally, the distance between the second clamping portion 32 and theadjacent third clamping portions 33 equals the sum of the width of theback contact cell 20 and the width of the gap.

Optionally, the ribbons 10 comprise a plurality of first ribbons 11 anda plurality of second ribbons 12. One of the two adjacent third clampingportions 33 is configured to clamp one of the first ribbons 11, and theother of the two adjacent third clamping portions 33 is configured toclamp one of the second ribbons 12. The third clamping portions 33comprise cutting members. The cutting members are configured to cutclamped portions of the plurality of first ribbons 11 and the pluralityof second ribbons 12.

Preferably, the cutting members are configured to simultaneously cut theclamped portions of the plurality of first ribbons 11 and the pluralityof second ribbons 12.

More preferably, the cutting members are configured to simultaneouslycut the clamped portions of all of the first ribbons 11 and all of thesecond ribbons 12 required for the entire cell string 100.

Optionally, the ribbons 10 comprise a plurality of first ribbons 11 anda plurality of second ribbons 12. The third clamping portions 33 areconfigured to clamp the first ribbons 11 and the second ribbons 12. Thethird clamping portions 33 comprise cutting members. The cutting membersof two adjacent third clamping portions 33 respectively correspond toone of the first ribbon 11 and one of the second ribbon 12. The cuttingmembers corresponding to the first ribbons 11 are configured to cutclamped portions of the plurality of first ribbons 11. The cuttingmembers corresponding to the second ribbons 12 are configured to cutclamped portions of the plurality of second ribbons 12.

Preferably, the cutting members corresponding to the first ribbons 11are configured to simultaneously cut the clamped portions of theplurality of first ribbons 11. The cutting members corresponding to thesecond ribbons 12 are configured to simultaneously cut clamped portionsof the plurality of second ribbons 12.

More preferably, the cutting members corresponding to the first ribbons11 are configured to simultaneously cut the clamped portions of all ofthe first ribbons 11 required for the entire cell string 100. Thecutting members corresponding to the second ribbons 12 are configured tosimultaneously cut the clamped portions of all of the second ribbons 12required for the entire cell string 100.

Optionally, transport portions are arranged among the first clampingportion 31, the second clamping portion 32, and the third clampingportions 33, and are configured to move a plurality of pressing tools 40from initial positions to lifted positions. The first clamping portion31, the second clamping portion 32, and the third clamping portions 33are configured to grab the ribbons 10. The transport portions areconfigured to move the plurality of pressing tools 40 from the liftedpositions to pressed positions, to cause the pressing tools 40 to pressthe back contact cells 20 on which the ribbons 10 are placed.

Preferably, the transport portions are configured to simultaneously movethe plurality of pressing tools 40 from the initial positions to thelifted positions. The first clamping portion 31, the second clampingportion 32, and the third clamping portions 33 are configured tosimultaneously grab the plurality of ribbons 10. The transport portionsare configured to simultaneously move the plurality of pressing tools 40from the lifted positions to the pressed positions, to cause thepressing tools 40 to simultaneously press the back contact cells 20 onwhich the ribbons 10 are placed.

More preferably, the transport portions are configured to simultaneouslymove all of the pressing tools 40 required for the entire cell string100 from the initial positions to the lifted positions. The firstclamping portion 31, the second clamping portion 32, and the thirdclamping portions 33 are configured to simultaneously grab all of theribbons 10 required for the entire cell string 100. The transportportions are configured to simultaneously move all of the pressing tools40 required for the entire cell string 100 from the lifted positions tothe pressed positions, to cause all of the pressing tools 40 requiredfor the entire cell string 100 to simultaneously press the back contactcells 20 on which the ribbons 10 are placed.

The foregoing descriptions are merely exemplary embodiments of thisapplication, but are not intended to limit this application. Anymodification, equivalent replacement, or improvement and the like madewithin the spirit and principle of this application fall within theprotection scope of this application.

What is claimed is:
 1. A soldering device, comprising a solderingplatform, a first clamping portion, a second clamping portion, thirdclamping portions, and a heater, wherein the soldering platform isconfigured to carry a plurality of back contact cells, back surfaces ofthe back contact cells face away from the soldering platform, andelectrodes corresponding to two adjacent back contact cells haveopposite polarities in a connection direction of ribbons; the firstclamping portion, the second clamping portion, and the third clampingportions respectively correspond to head ends, tail ends, and middleportions of the plurality of ribbons, and are configured to place aplurality of to-be-connected ribbons on the electrodes of the pluralityof back contact cells; and the heater is configured to heat theplurality of ribbons to connect the plurality of ribbons to theplurality of back contact cells.
 2. The soldering device of claim 1,wherein the first clamping portion, the second clamping portion, and thethird clamping portions are configured to simultaneously place theplurality of to-be-connected ribbons on the electrodes of the pluralityof back contact cells; and the heater is configured to simultaneouslyheat the plurality of ribbons to simultaneously connect the plurality ofribbons to the plurality of back contact cells.
 3. The soldering deviceof claim 2, wherein the first clamping portion, the second clampingportion, and the third clamping portions are configured tosimultaneously place all of the ribbons required for an entire cellstring on the electrodes of the plurality of back contact cells; and theheater is configured to simultaneously heat all of the ribbons requiredfor the entire cell string, to simultaneously connect all of the ribbonsrequired for the entire cell string to all of the back contact cells. 4.The soldering device of claim 1, wherein the ribbons comprise aplurality of first ribbons and a plurality of second ribbons; the firstclamping portion comprises a plurality of first clamping jaws and aplurality of second clamping jaws; the first clamping jaws and thesecond clamping jaws are in staggered arrangement; the first clampingjaws are configured to clamp head ends of the first ribbons, and thesecond clamping jaws are configured to clamp head ends of the secondribbons; and the second clamping portion comprises a plurality of thirdclamping jaws and a plurality of fourth clamping jaws; the thirdclamping jaws and the fourth clamping jaws are in staggered arrangement;the third clamping jaws are configured to clamp tail ends of the firstribbons, and the fourth clamping jaws are configured to clamp tail endsof the second ribbons.
 5. The soldering device of claim 1, wherein a gapis formed between each two adjacent back contact cells, and each thirdclamping portion corresponds to one gap.
 6. The soldering device ofclaim 5, wherein a distance between two adjacent third clamping portionsis greater than a width of each of the back contact cells.
 7. Thesoldering device of claim 5, wherein a distance between the firstclamping portion and adjacent third clamping portions is greater than awidth of each of the back contact cells.
 8. The soldering device ofclaim 5, wherein a distance between the second clamping portion andadjacent third clamping portions is greater than a width of each of theback contact cells.
 9. The soldering device of claim 5, wherein theribbons comprise a plurality of first ribbons and a plurality of secondribbons; the third clamping portions comprise cutting members, thecutting members of two adjacent third clamping portions respectivelycorrespond to one of the first ribbons and one of the second ribbons,and the cutting members corresponding to the first ribbons areconfigured to cut clamped portions of the plurality of first ribbons;and the cutting members corresponding to the second ribbons areconfigured to cut clamped portions of the plurality of second ribbons;and the third clamping portions are configured to clamp the firstribbons and the second ribbons; or, one of two adjacent third clampingportions is configured to clamp the first ribbons, and the other of thetwo adjacent third clamping portions is configured to clamp the secondribbons.
 10. The soldering device of claim 9, wherein the cuttingmembers corresponding to the first ribbons are configured tosimultaneously cut the clamped portions of the plurality of firstribbons; and the cutting members corresponding to the second ribbons areconfigured to simultaneously cut the clamped portions of the pluralityof second ribbons.
 11. The soldering device of claim 10, wherein thecutting members corresponding to the first ribbons are configured tosimultaneously cut the clamped portions of all of the first ribbonsrequired for the entire cell string; and the cutting memberscorresponding to the second ribbons are configured to simultaneously cutthe clamped portions of all of the second ribbons required for theentire cell string.
 12. The soldering device of claim 1, whereintransport portions are arranged among the first clamping portion, thesecond clamping portion, and the third clamping portions, and thetransport portions are configured to move a plurality of pressing toolsfrom initial positions to lifted positions; the first clamping portion,the second clamping portion, and the third clamping portions areconfigured to grab the plurality of ribbons; and the transport portionsare configured to move the plurality of pressing tools from the liftedpositions to pressed positions, to cause the pressing tools to press theback contact cells on which the ribbons are placed.
 13. The solderingdevice of claim 12, wherein the transport portions are configured tosimultaneously move the plurality of pressing tools from the initialpositions to the lifted positions; the first clamping portion, thesecond clamping portion, and the third clamping portions are configuredto simultaneously grab the plurality of ribbons; and the transportportions are configured to simultaneously move the plurality of pressingtools from the lifted positions to the pressed positions, to cause thepressing tools to simultaneously press the back contact cells on whichthe ribbons are placed.
 14. The soldering device of claim 13, whereinthe transport portions are configured to simultaneously move all of thepressing tools required for the entire cell string from the initialpositions to the lifted positions; the first clamping portion, thesecond clamping portion, and the third clamping portions are configuredto simultaneously grab all of the ribbons required for the entire cellstring; and the transport portions are configured to simultaneously moveall of the pressing tools required for the entire cell string from thelifted positions to the pressed positions, to cause all of the pressingtools required for the entire cell string to simultaneously press theback contact cells on which the ribbons are placed.